Wiper for copper-plate-printing machines.



PATENTED APR. 18, 1905.

. M. RUDOMETOPP. WIPER FOR COPPER PLATE PRINTING MACHINES.

APPLICATION FILED FEB. 55, 1904.

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UNITED STATES Patented April 18, 1905.

MICHAEL RUDOMETOFF, OF GOTTSCHINA, RUSSIA.

WIPER FOR COPPER-PLATE-PFHNTING MACHINES.

SPECIFICATION forming part of Letters Patent No. 787,542, dated April18, 1905.

' Application filed February 5, 1904. Serial No. 192,173.

To all whom, it may concern:

Be it known that I, MICHAEL RUDOMETOFF, a subject of the Emperor ofRussia, residing at Gottschina, near St. Petersburg. in the Empire ofRussia, have invented a new and useful Improved Viper forCopper-Plate-Printing Machines, of which the following is aspecification. A

It is a well-known fact that the prints produced bycopper-plate-printing machines can not be compared, as far as artisticeffectis concerned. with the impressions produced by hand-presses forcopper plate printing, the reason being that in the case of hand-pressesthe local toning produced at various places by the palm of the hand withthe most various gradations, with,if desired, simultaneous completeavoidance of toning at other places, could not be obtained in the caseof copper-plateprinting machines in consequence of the only simpleadjustability of the wipers. These wipers used in the latter kind ofmachines, which should imitate the action of the palm of the hand of thecopper-press printer as far as the toning is concerned, can only produceprints with full toning or no toning at all, but cannot effect agradation in the toning.

The present invention relates to a Wiper for copper-plate-printingmachines which is adjustable both as a Whole and also in its separateparts with regard to its action on the pri ntingplate.so thateithcrfully-toned prints or prints not toned at all can be produced, as hasalready been the case, and also, moreover, prints which are in partstoned and are in parts not toned or possess differentdegrees of toning,so that the prints produced with such wipers on copper-.plate-printingmachines become exactly of the same value as the prints produced withhand-presses.

The form of a wiper according to the present invention is represented inthe drawings, in which Figure 1 is a longitudinal section through thewiper, and Fig. 2 is a transverse section through the same.

. 1 is a part of the frame of a copper-plateprinting machine on which,by means of the screws 2, the wiper 3 can be adjusted in'a Wellknownmanner. This adjustability of the pressing with their under ends on athin metal or wooden plate 8. Under this plate 8 there lie a number ofstrips of cloth or padding 9, which are surrounded with a wiper fabric10, which may suitably consist of shirting. For fastening this fabric 10hooks 11 are arranged on the side surfaces of the plate 4, on which thecover 10 is hooked and secured by steel plates 12. As is readilyunderstood, a wiper formed in this manner can be adjusted not only as awhole by means of the screws 2, but

also in its separate parts by means of the screws 5, 6, and 7, so thatthe elasticity corresponding to the palm of the hand of the copper-plateprinter is obtained. This wiper is thus provided with adjustable meansfor stretching the operative surface at different parts to differentextents. It is essential for the action that the threads of the fabricof the cover 10 lie diagonally with regard to the longitudinal axis ofthe wiper, as in this case alone the fabric possesses suflicientextensibility. The effect of the screws 5 6 7 can be further increasedby providing the tightlystretched cover with incisions in the sides atthose places Where a thorough and yet delicate wiping of the engravedplate is to take place. In consequence of the tension to which the coveris subjected bulging parts or pockets 14L will arise on the under sideof the wiper, which are extraordinarily well adapted to imitate theaction of the palm of the hand. The operative surface of the wiper isthus stretched to various extents, so that after wiping the inked plategradations in toning can be obtained.

In order to facilitate the action of this Wiper, it is useful to use,not, as formerly generally customary, a uniformly consistent oruniformly fatty ink, but to use, according to the toning, more or lessconsistent or more or less fatty inks. By using for places which requireno toning inks containing less fat or no fat at all or more consistentinks one can completely remove the ink with great ease by means of theabove-described wiper, which wipes these places suitably, while byemploying more fatty or less consistent inks for places which requiretoning at the same time as that in which the less fatty ink is removedby the wiper from the untoned places this has not yet been completelyattained at the places requiring toning, so that, on printing, thedesired toning with the requisite gradation can be obtained. Thetransfer of such more or less fatty or more or less consistent inkstakes place by means of the arrangement of collecting-blocks known inpolychrome printing, such as that proposed by Orloff and Rudometoff;

What I claim is 1. A wiper for copper-plate-printing machines,consisting of the combination of a backing, padding supported therefrom,a wiper fabric stretched over said padding, adjustable means forstretching the operative surface ofthe fabric at different parts todifferent extents, threads in said wiper fabric running diagonally withregard to the longitudinal axis of the Wiper, and means for adjustingthe wiper asa whole on acopper-plateprinting machine.

2. A wiper for copper-plate-printing machines, consisting, incombination, of a backing, padding supported therefrom, a wiper fabricstretched over said padding, adjustable means for stretching theoperative surface of the fabric at different parts to different extents,threads in said wiper fabric running diagonally with regard to thelongitudinal axis of the wiper, incisions in the wiper fabric at thesides of the wiper, bulging parts on the under surface of the wiper, andmeans for adjusting the wiper as a whole on a copperplate-printingmachine.

3. A wiper for copper-plate-printing machines, consisting, incombination of a backing 4, strips of cloth 9 supported therefrom, awiper fabric 10 stretched over said strips of cloth and supporting thesame, a plate 8 resting on said strips, screws 5, 6, 7, in the plate 4,their ends being adapted to press upon plate 8, threads in said wiperfabric running diagonally with regard to the longitudinal axis of thewiper, incisions 13 in the wiper fabric at the sides of the wiper,bulging parts 14 on the under surface of the wiper, and means foradjusting the wiper as a whole on a copper-plate-printing machine.

4. A wiper for copper-plate-printing machines, consisting, incombination, of a backing 4:, strips of cloth 9 supported therefrom, awiper fabric 10 stretched over and supporting said strips of cloth,hooks 11 on the plate 4, plates 12, for securing said fabric on saidhooks, a plate 8 resting on said strips, screws 5, 6, 7 in the plate 4,adapted to press upon and adjust said plate 8, threads in said wiperfabric running diagonally with regard to the longitudinal axis of thewiper, incisions "13 in the wiper fabric at the sides of the wiper,bulging parts 14 on the under surface of the same, and screws 2 foradjusting the wiper as a Whole on a copper-plate-printing machine.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

MICHAEL RUDOMETOFF.

Witnesses:

H. A. LOVIAGUIRE, ANDREI MOROGOFF.

